NEW YORK, NY - OCTOBER 20: Kendall Jenner walks the runway during the Balmain x H&M Collection launch at 23 Wall Street on October 20, 2015 in New York City. (Photo by D Dipasupil/Getty Images)
Credit: D Dipasupil

It may as well have been dubbed the #GirlSquad runway Tuesday night in New York City, with Kendall Jenner, Gigi Hadid, and Karlie Kloss strutting their chosen glitzy looks down the catwalk for the Balmain x H&M runway show. Inside what was designed to mimic a two-tiered futuristic nightclub.

Balmain Creative Director Olivier Rousteing set the scene with a dimly lit, multifaceted runway presentation filled with an A-list from row, including Kylie Jenner (below), Alexa Chung, and Coco Rocha.

NEW YORK, NY - OCTOBER 20: Kylie Jenner attends the BALMAIN X H&M Collection Launch at 23 Wall Street on October 20, 2015 in New York City. (Photo by Dimitrios Kambouris/Getty Images for H&M)
Credit: Dimitrios Kambouris

Male and female models donned the head-to-toe embellished, sequined, and ornately crafted ensembles from the collaboration. And who was on hand to strut? Karlie Kloss wowed audiences with her panther-like prowl, while Bella Hadid (below, left) Alessandra Ambrosia (below, center), Joan Smalls (below, right) , and Victoria's Secret favorite Dev Windsor followed soon after.

Balmain Models
Credit: Etienne Tordoir/WireImage (2), Randy Brooke/Getty Images

Once the #BalmainArmy paraded about the venue for their final walk, an emcee took to the speakers to announce an unexpected performance: In what felt like 1998 all over again, Nick Carter, Brian Littrell, A. J. McLean, Howie Dorough, and Kevin Richardson​ performed during an epic Backstreet Boys (below) reunion.

Backstreet Boys Balmain
Credit: Larry Busacca/Getty Images

The former boy band stars kicked the party off with "Backstreet's Back" and later performed "I Want It That Way" and "Larger Than Life" as guests belted out their favorite lines. And while the surprise was reason enough to head home satisfied, the night was far from over; everyone immediately rushed down to the building's lower level to start the shopping frenzy.

Alexa Chung and model Martha Hunt independently perused racks of gilded dresses and separates while ambitious fiends of the collaboration raced across the room to grab items before they were gone. Men flung their shirts off without hesitation to try on blazers and fitted tees, while seconds into the shopping kickoff the checkout line began to endlessly form. All in all, it was certainly an evening to remember.